The Danish Standard DS 447 “Ventilation in build­ings – Mechanical, natural and hybrid ventilation systems” was published in January 2022. This standard specifies the requirements for ventilation in buildings intended for human occupancy. The purpose of this standard is to ensure that ventilation systems are designed, constructed and can be maintained in a technical and hygienic responsible way considering comfort and energy efficiency.

According to the standard, in offices due to a slightly higher physical activity upon arrival at work, it is allowed to start with 1 K lower room temperature within the first hour of occupancy. This increases the potential for using night cooling.